EXPLANATION OF PLATE VIII. (Upper Half.) 



Fig. 1. Haplophragmium ghmeratum, Brady, magnified 60 diam. Off Killy- 



begs Harbour, 17 fms. 

 Fig. 2. Bulimina subteres, Brady, magnified 60 diam. Off Killybegs Harbour, 



17 fms. 

 Fig. 3. Gaudryina filiformis, Berthelin, magnified 60 diam. Off Killybegs 



Harbour, 17 fms. 

 Fig. 4. Lagena marginata, W. & J., magnified 60 diam. Off Killybegs 



Harbour, 17 fms. 

 Fig. 5. Lagena marginata, var. Orbignyana, Seguenza, magnified 60 diam. 



Off Killybegs Harbour, 17 fms. 



EXPLANATION OF PLATE VIII. (Lower Half.) 



Fig. 1. Holasterdla Wrightii, spicule of, nat. size. The largest met with 



(diagram). 

 Fig. 2. The same, restored, to show the perfect form -with spiral inflation on 



the arms. Magnified 7 diameters. 

 Fig. 3. Tbe same. Furcate arm, much more magnified, to show — a, the simple 



spiral inflation, and b, the same when " broken up." Scale l-48th 



to l-1800th inch. 

 Figs. 4, 5, 6, and 7. The same, to show the simple sexradiate and multifid 



divisions of the arms respectively (diagrams). 

 Fig. 8. Sarcohexactinellid. Fragment of large surface-spicule of unknown 



Fig. 9. The same. Free end of anchoring-spicule. 



Fig. 10. Lithistid. ? Tripod-like surface-spicule of unknown species. 



Fig. 11. The same. Lateral view. 



Fig. 12. The same. Dendritically branched surface-spicule of unknown 



species. 

 Fig. 13. The same. Form of body-spicule of unknown species. 

 Fig. 14. Eeniera ?. Sausage-shaped spicule of unknown species. 

 Fig. 15. Acerate spicule of unknown sponge. 

 Fig. 16. The same. 

 Fig. 17. Quadriradiate fragment of spicule of unknown sponge. 



N.B. — Figs. 3 and 8-17 inclusively are all drawn to the scale of l-48th 

 to l-1800th inch. 



